{"id":430,"date":"2014-08-06T05:00:00","date_gmt":"2014-08-06T09:00:00","guid":{"rendered":"https:\/\/maizex.com\/des-feuilles-de-soya-teintees-de-rouge\/"},"modified":"2014-08-06T16:23:00","modified_gmt":"2014-08-06T16:23:00","slug":"des-feuilles-de-soya-teintees-de-rouge","status":"publish","type":"post","link":"https:\/\/maizex.com\/fr\/des-feuilles-de-soya-teintees-de-rouge\/","title":{"rendered":"Des feuilles de soya teint\u00e9es de ROUGE?"},"content":{"rendered":"<p>Des probl&egrave;mes r&eacute;cents, observ&eacute;s dans certains champs de soya en Ontario, ont suscit&eacute; des inqui&eacute;tudes concernant un nouveau virus qui aurait fait son apparition chez-nous. Le virus de la n&eacute;crose des nervures du soya (<em>VNNS &ndash; SVNV en anglais<\/em>) est une maladie relativement nouvelle dans les zones de culture du soya au nord des &Eacute;tats-Unis, alors qu&rsquo;il est plus courant dans le sud des &Eacute;tats-Unis.<\/p>\n\n<p>En g&eacute;n&eacute;ral, les sympt&ocirc;mes d&eacute;butent autour de la nervure centrale de la feuille de soya et ils se r&eacute;pandent &agrave; toutes les feuilles en suivant les nervures. Ce sont les thrips (thysanopt&egrave;res) qui transportent le virus d&rsquo;un plant &agrave; l&rsquo;autre, alors qu&rsquo;ils se nourrissent. Les zones autour de la nervure centrale passent du vert p&acirc;le au jaune, pour ensuite virer au rouge avant de n&eacute;croser (brunissement ou mort de cellules). En g&eacute;n&eacute;ral, le VNNS se propage lentement &agrave; l&rsquo;int&eacute;rieur du plant, en progressant vers la couverture foliaire.<\/p>\n\n<p>Les sympt&ocirc;mes du VNNS ressemblent beaucoup aux dommages caus&eacute;s au ma&iuml;s par les graminicides du groupe 1 (ACCase &ndash; Assure<sup>MD<\/sup> II). Des taux &eacute;lev&eacute;s d&rsquo;Assure<sup>MD<\/sup> II peuvent &eacute;galement affecter les zones autour de la nervure centrale, qui passeront au jaune, et ensuite au rouge. La grande diff&eacute;rence entre les deux r&eacute;side dans la progression de ces sympt&ocirc;mes. Avec le temps, le VNNS se r&eacute;pand sur l&rsquo;ensemble des feuilles et vers la partie sup&eacute;rieure du plant. Dans le cas de l&rsquo;herbicide avec ACCase, la blessure caus&eacute;e par l&rsquo;herbicide est limit&eacute;e aux feuilles pr&eacute;sentes lors de l&rsquo;application de cet herbicide (i.e.&nbsp;: les nouvelles pousses ne sont pas affect&eacute;es).<\/p>\n\n<p>Des strat&eacute;gies efficaces de gestion du VNNS n&rsquo;ont pas encore &eacute;t&eacute; &eacute;tablies. La surveillance hebdomadaire de votre champ vous aidera &agrave; bien identifier la cause des probl&egrave;mes.<\/p>\n\n<p>Photo : illustration des sympt&ocirc;mes caus&eacute;s par une application d&rsquo;ACCase.&nbsp;<\/p>\n\n<p><em>Shawn Winter, CCA-ON,<\/em><br \/>\n<em>Directeur du d&eacute;veloppement de produit chez Maizex<\/em><br \/>\n<em>Twitter<\/em> : <a href=\"https:\/\/twitter.com\/SWinter_Maiz\"><em>@SWinter_Maiz<\/em><\/a>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Des probl&egrave;mes r&eacute;cents, observ&eacute;s dans certains champs de soya en Ontario, ont suscit&eacute; des inqui&eacute;tudes concernant un nouveau virus qui aurait fait son apparition chez-nous. Le virus de la n&eacute;crose&#8230;<\/p>\n","protected":false},"author":2,"featured_media":238,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"footnotes":"","_tec_slr_enabled":"","_tec_slr_layout":""},"categories":[63,31],"tags":[65,40],"class_list":["post-430","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-agronomie","category-agronomy","tag-soya","tag-soybeans"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Des feuilles de soya teint\u00e9es de ROUGE? - Maizex Seeds Inc.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/maizex.com\/fr\/des-feuilles-de-soya-teintees-de-rouge\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Des feuilles de soya teint\u00e9es de ROUGE? - Maizex Seeds Inc.\" \/>\n<meta property=\"og:description\" content=\"Des probl&egrave;mes r&eacute;cents, observ&eacute;s dans certains champs de soya en Ontario, ont suscit&eacute; des inqui&eacute;tudes concernant un nouveau virus qui aurait fait son apparition chez-nous. 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